An Action Potential in a Neuronal Membrane Differs from a Graded

question 83

Multiple Choice

An action potential in a neuronal membrane differs from a graded potential in that:

• A) an action potential requires the opening of Ca²⁺ channels, whereas a graded potential does not.
• B) an action potential is propagated without decrement, whereas a graded potential decrements with distance.
• C) an action potential has a threshold, whereas a graded potential is an all-or-none phenomenon.
• D) movement of Na⁺ and K⁺ across cell membranes mediate action potentials, while graded potentials do not involve movement of Na⁺ and K⁺.
• E) action potentials vary in size with the size of a stimulus, while graded potentials do not.

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Definitions:

Periodic system

An inventory accounting system that updates inventory balance and cost of goods sold at the end of an accounting period.

Ending inventory

The total value or quantity of goods on hand at the end of an accounting period.

LIFO method

An inventory cost-flow assumption where the last items purchased or produced are the first to be expensed as sold, opposite of FIFO.

Cost of merchandise sold

The total expense incurred to produce or purchase the goods sold by a company during a specific period.